Use of Decision table in SAP BRFPlus

Hi Expert,

I am new in SAP BRF+ .

Here I want to know what is the use of the Decision table in BRF+.

If element (name) is equal to decision table (XYZ)

Then.

Change value of element(marks) to 81.

In this statement what is the use of decision table and what exactly this statement doing here ?

Thanks,

Atul katoch.